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Astrophotography > photorick  > Astronomy > Large Observatories > Palomar 200 inch Telescope
The 200” Hale telescope is the forth in a series of large telescopes that George Hale envisioned and was the driving force that made those projects successful. He built the largest telescope in the world four times in a row! At the start of this project in 1938 there were several major inventions required to even make a telescope of this size possible. There are several books that chronicle the fascinating story of the construction of this telescope that are worth reading. This is a selection of photos from two visits to Palomar in the early 90’s. On the second visit I was privileged to spend three nights with astronomers as they worked on two projects related to proper motion of stars and a quasar hunt.
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37,  The prime focus elevator is supported in the middle by a large pipe.  This pipe is rotated as the elevator moves along the curve of the dome in order to keep the elevator level.  Believe me, keeping the elevator level when it’s over 6 stories in the air is a really good thing.  The elevator shakes as it moves up the curved track because you are on a cantilevered structure.  It's much like a diving board with side rails!
38,  This is a close up of the elevator carriage that rides along the curved track that is approximately concentric with the center of the dome.  This geometry means that the end of the elevator can be moved to within about 10 inches of the prime focus observers' cage no matter where the telescope is pointed.  There is a gear train on this carriage that makes sure the elevator walkway always stays level.
39,  The curved track of the elevator is seen in this photo next to the emergency ladder.  If the elevator fails to operate the emergency ladder is your escape route (remember 6 stories).  One night I thought we would have to use the ladder because we couldn’t get the elevator to move.  We discovered that one of the safety gates at the end of the elevator wasn’t closed all the way and an interlock switch was preventing the elevator from moving.  Notice that the windscreen is up in this photo because the shutters were open.
40,  At the top of the elevator travel you can see the carriage is almost level as opposed to being vertical at the bottom of the track.
41,  You can see how close the elevator comes to the observers’ cage in this photo.  There is a light duty hoist on the end of the elevator that can be used to move heaver objects in and out of the cage.
42,  Swinging to the right from the previous photo you get a view of the 50 ton crane built into the dome for moving and assembling heavy objects.  The crane operator sits in the box on the left when using this crane.  There are some lighter duty hoists on that platform too.
43,  This is a copy of a small photo pinned to the bulletin board in the control room.  It appears that the workers assembling the telescope back in the 30’s or 40’s had a sense of humor.  They suspended someone’s truck high in the dome using one of the hoists on the overhead crane.
44,  The vacuum chamber for aluminizing the mirror can be seen from this vantage point part way up the elevator track.
45,  Under the vacuum chamber is a steel frame with large steel wheels like those used on the railroad.  This platform is rolled under the mirror and the big hydraulic ram under the floor is used to lower the mirror and mirror cell onto this platform.  The mirror is then cleaned and rolled under the chamber to go through the coating process.
39, The curved track of the elevator is seen in this photo next to the emergency ladder. If the elevator fails to operate the emergency ladder is your escape route (remember 6 stories). One night I thought we would have to use the ladder because we couldn’t get the elevator to move. We discovered that one of the safety gates at the end of the elevator wasn’t closed all the way and an interlock switch was preventing the elevator from moving. Notice that the windscreen is up in this photo because the shutters were open.
39,  The curved track of the elevator is seen in this photo next to the emergency ladder.  If the elevator fails to operate the emergency ladder is your escape route (remember 6 stories).  One night I thought we would have to use the ladder because we couldn’t get the elevator to move.  We discovered that one of the safety gates at the end of the elevator wasn’t closed all the way and an interlock switch was preventing the elevator from moving.  Notice that the windscreen is up in this photo because the shutters were open.
39, The curved track of the elevator is seen in this photo next to the emergency ladder. If the elevator fails to operate the emergency ladder is your escape route (remember 6 stories). One night I thought we would have to use the ladder because we couldn’t get the elevator to move. We discovered that one of the safety gates at the end of the elevator wasn’t closed all the way and an interlock switch was preventing the elevator from moving. Notice that the windscreen is up in this photo because the shutters were open.
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